223 lines
7.1 KiB
C
223 lines
7.1 KiB
C
/*
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* Copyright (c) 2010 Brandon Mintern
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* Copyright (c) 2007 Bobby Bingham
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* video fade filter
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* based heavily on vf_negate.c by Bobby Bingham
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*/
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#include "libavutil/common.h"
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#include "libavutil/opt.h"
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#include "libavutil/pixdesc.h"
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#include "avfilter.h"
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#include "formats.h"
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#include "internal.h"
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#include "video.h"
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#define FADE_IN 0
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#define FADE_OUT 1
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typedef struct FadeContext {
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const AVClass *class;
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int type;
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int factor, fade_per_frame;
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int start_frame, nb_frames;
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unsigned int frame_index, stop_frame;
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int hsub, vsub, bpp;
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} FadeContext;
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static av_cold int init(AVFilterContext *ctx)
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{
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FadeContext *s = ctx->priv;
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s->fade_per_frame = (1 << 16) / s->nb_frames;
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if (s->type == FADE_IN) {
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s->factor = 0;
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} else if (s->type == FADE_OUT) {
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s->fade_per_frame = -s->fade_per_frame;
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s->factor = (1 << 16);
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}
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s->stop_frame = s->start_frame + s->nb_frames;
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av_log(ctx, AV_LOG_VERBOSE,
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"type:%s start_frame:%d nb_frames:%d\n",
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s->type == FADE_IN ? "in" : "out", s->start_frame,
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s->nb_frames);
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return 0;
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}
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static int query_formats(AVFilterContext *ctx)
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{
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static const enum AVPixelFormat pix_fmts[] = {
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AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV420P,
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AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P,
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AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P,
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AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUVJ440P,
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AV_PIX_FMT_RGB24, AV_PIX_FMT_BGR24,
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AV_PIX_FMT_NONE
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};
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ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
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return 0;
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}
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static int config_props(AVFilterLink *inlink)
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{
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FadeContext *s = inlink->dst->priv;
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const AVPixFmtDescriptor *pixdesc = av_pix_fmt_desc_get(inlink->format);
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s->hsub = pixdesc->log2_chroma_w;
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s->vsub = pixdesc->log2_chroma_h;
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s->bpp = av_get_bits_per_pixel(pixdesc) >> 3;
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return 0;
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}
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static int filter_slice_luma(AVFilterContext *ctx, void *arg, int jobnr,
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int nb_jobs)
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{
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FadeContext *s = ctx->priv;
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AVFrame *frame = arg;
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int slice_h = frame->height / nb_jobs;
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int slice_start = jobnr * slice_h;
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int slice_end = (jobnr == nb_jobs - 1) ? frame->height : (jobnr + 1) * slice_h;
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int i, j;
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for (i = slice_start; i < slice_end; i++) {
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uint8_t *p = frame->data[0] + i * frame->linesize[0];
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for (j = 0; j < frame->width * s->bpp; j++) {
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/* s->factor is using 16 lower-order bits for decimal
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* places. 32768 = 1 << 15, it is an integer representation
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* of 0.5 and is for rounding. */
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*p = (*p * s->factor + 32768) >> 16;
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p++;
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}
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}
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return 0;
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}
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static int filter_slice_chroma(AVFilterContext *ctx, void *arg, int jobnr,
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int nb_jobs)
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{
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FadeContext *s = ctx->priv;
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AVFrame *frame = arg;
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int slice_h = FFALIGN(frame->height / nb_jobs, 1 << s->vsub);
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int slice_start = jobnr * slice_h;
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int slice_end = (jobnr == nb_jobs - 1) ? frame->height : (jobnr + 1) * slice_h;
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int i, j, plane;
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for (plane = 1; plane < 3; plane++) {
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for (i = slice_start; i < slice_end; i++) {
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uint8_t *p = frame->data[plane] + (i >> s->vsub) * frame->linesize[plane];
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for (j = 0; j < frame->width >> s->hsub; j++) {
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/* 8421367 = ((128 << 1) + 1) << 15. It is an integer
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* representation of 128.5. The .5 is for rounding
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* purposes. */
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*p = ((*p - 128) * s->factor + 8421367) >> 16;
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p++;
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}
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}
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}
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return 0;
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}
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static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
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{
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AVFilterContext *ctx = inlink->dst;
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FadeContext *s = ctx->priv;
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if (s->factor < UINT16_MAX) {
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/* luma or rgb plane */
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ctx->internal->execute(ctx, filter_slice_luma, frame, NULL,
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FFMIN(frame->height, ctx->graph->nb_threads));
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if (frame->data[1] && frame->data[2]) {
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/* chroma planes */
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ctx->internal->execute(ctx, filter_slice_chroma, frame, NULL,
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FFMIN(frame->height, ctx->graph->nb_threads));
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}
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}
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if (s->frame_index >= s->start_frame &&
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s->frame_index <= s->stop_frame)
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s->factor += s->fade_per_frame;
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s->factor = av_clip_uint16(s->factor);
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s->frame_index++;
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return ff_filter_frame(inlink->dst->outputs[0], frame);
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}
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#define OFFSET(x) offsetof(FadeContext, x)
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#define FLAGS AV_OPT_FLAG_VIDEO_PARAM
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static const AVOption options[] = {
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{ "type", "'in' or 'out' for fade-in/fade-out", OFFSET(type), AV_OPT_TYPE_INT, { .i64 = FADE_IN }, FADE_IN, FADE_OUT, FLAGS, "type" },
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{ "in", "fade-in", 0, AV_OPT_TYPE_CONST, { .i64 = FADE_IN }, .unit = "type" },
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{ "out", "fade-out", 0, AV_OPT_TYPE_CONST, { .i64 = FADE_OUT }, .unit = "type" },
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{ "start_frame", "Number of the first frame to which to apply the effect.",
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OFFSET(start_frame), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, FLAGS },
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{ "nb_frames", "Number of frames to which the effect should be applied.",
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OFFSET(nb_frames), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, INT_MAX, FLAGS },
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{ NULL },
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};
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static const AVClass fade_class = {
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.class_name = "fade",
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.item_name = av_default_item_name,
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.option = options,
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.version = LIBAVUTIL_VERSION_INT,
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};
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static const AVFilterPad avfilter_vf_fade_inputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.config_props = config_props,
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.get_video_buffer = ff_null_get_video_buffer,
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.filter_frame = filter_frame,
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.needs_writable = 1,
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},
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{ NULL }
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};
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static const AVFilterPad avfilter_vf_fade_outputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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},
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{ NULL }
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};
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AVFilter ff_vf_fade = {
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.name = "fade",
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.description = NULL_IF_CONFIG_SMALL("Fade in/out input video"),
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.init = init,
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.priv_size = sizeof(FadeContext),
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.priv_class = &fade_class,
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.query_formats = query_formats,
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.inputs = avfilter_vf_fade_inputs,
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.outputs = avfilter_vf_fade_outputs,
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.flags = AVFILTER_FLAG_SLICE_THREADS,
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};
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